JP4082793B2

JP4082793B2 - Processing receptacle and plastic hole punching method

Info

Publication number: JP4082793B2
Application number: JP21294198A
Authority: JP
Inventors: 富夫工藤; 吉治桜庭
Original assignee: 大川精螺工業株式会社
Priority date: 1998-07-28
Filing date: 1998-07-28
Publication date: 2008-04-30
Anticipated expiration: 2018-07-28
Also published as: JP2000042649A

Description

【０００１】
【発明の属する技術分野】
本発明は、加工用受け具に関し、特に、筒状の加工対象物の側面に塑性加工によって孔抜きを行う際に筒状の加工対象物の内部に設けられる加工用受け具及び加工用受け具を用いた塑性孔抜き方法に関するものである。
【０００２】
【従来の技術】
筒状の加工対象物（以後、加工対象物と称す。）の側面に孔を形成する方法の１つとして図８に示すような方法が挙げられる。この方法は、孔精度保証や加工物の変形を防止する場合に行なわれており、円筒状部材２０の内部に嵌合する寸法の外形を備えた円筒状の芯金７２と、孔抜きピン３０とを用い、円筒状部材２０の内部に円筒状の芯金７２を挿入して固定した状態で孔抜きピン３０により円筒状部材２０の外側から側面の予め定めた孔抜き位置に塑性加工によって孔抜きする方法である。
【０００３】
芯金７２には、自身の端面からほぼ円筒状部材２０の幅寸法分離れた位置に、円筒状部材２０の軸方向の移動を阻止する端面押え７４が設けられていると共に、円筒状部材２０の側面の孔形成位置に対応する芯金７２の側面位置に、抜きカスを芯金７２の内部孔７９に導くための受け孔７６が設けられている。芯金７２の内部孔７９は抜きカスを外部に排出するためのカス抜き孔として利用されており、孔抜きピン３０により円筒状部材２０の側面に穿孔された時に発生した抜きカスを外部に排出できる構成とされている。
【０００４】
また、芯金７２の強度が不足する場合や、円筒状部材２０に穿孔した時に開孔部がダレるのを防止したり、高精度に穴あけを行うことが要求される場合や、円筒状部材２０の端面に対して孔を形成する予定の位置が近く、端面が変形する恐れがある場合に、図９に示すように金型８０ａ、８０ｂを用いることもある。この場合、上側に配置された上金型８０ａには孔形成位置に対応する位置に孔抜きピン３０を通過させるためのピンガイド孔８２が形成されている。
【０００５】
したがって、図８において説明した芯金７２を円筒状部材２０に挿入した状態で上下金型８０ａ、８０ｂに収めて、上下金型８０ａ、８０ｂをクランプすることにより上下金型８０ａ、８０ｂ内の円筒状部材２０及び芯金７２を固定し、孔抜きピン３０をピンガイド孔８２を通して円筒状部材２０の側面に押し付け、孔抜きする。
【０００６】
【発明が解決しようとする課題】
しかしながら、従来では、抜きカスを円筒状芯金の内部孔であるカス抜き孔に通して取除くため、多数の加工対象物に続けて塑性加工によって孔抜きするためには、カス抜き孔から抜きカスを取除く作業を頻繁に行わなければならず、作業性が悪いという難点がある。
【０００７】
また、カス抜き孔内の抜きカスを取除くには、穿孔した時に発生する抜きカスの寸法をカス抜き孔の径よりも小さくしなければならないため、加工対象物に形成できる孔の大きさが制限されてしまうという難点がある。すなわち、加工対象物に形成できる孔の径の目安としては、カス抜き孔の径に対して５０％程度の寸法とされている。例えば、丸孔形状で考えた場合、加工対象物の内径の２５％程度までとなる。更に、抜きカス除去する作業自体も難しく、生産性が悪いという問題もある。
【０００８】
また、加工対象物の孔抜き可能な位置は、加工対象物の変形を防止するために、少なくとも端面から孔抜き厚さ以上の寸法だけ離れた位置に制限されるという難点もある。
【０００９】
以上のことから本発明は、抜きカス除去する作業の簡単な加工用受け具を提供することを第１の目的とする。また、加工対象物に形成できる孔寸法を従来より大きくできる加工用受け具を提供することを第２の目的とする。さらに、加工対象物の孔抜き位置を従来よりも端面側とできる加工用受け具を提供することを第３の目的とする。
【００１０】
さらに、本発明では、作業性がよく生産性が向上する塑性孔抜き方法を提供することを第４の目的とする。
【００１１】
【課題を解決するための手段】
上記第１の目的を達成するために、請求項１の発明の加工用受け具は、穿孔ピンにより筒状の加工対象物の側面に塑性加工によって孔抜きする際に筒状の加工対象物を支持する加工用受け具であって、筒状の加工対象物の内部に嵌合する形状の外形を備え、前記筒状の加工対象物の内部に挿入されると共に筒状の加工対象物の側面の穿孔予定位置に対応する位置にピン受け孔が形成され、前記ピン受け孔位置で分割可能に構成されると共に、前記筒状の加工対象物の端面を挟持する端面押え部が形成され、前記穿孔ピンが前記筒状の加工対象物の前記穿孔予定位置から前記筒状の加工対象物の側面を貫通して前記ピン受け孔に挿入されることにより前記筒状の加工対象物の側面から切り離された穿孔屑を、分割されて前記筒状の加工対象物から引き抜かれることによって前記筒状の加工対象物の内部に残留させる芯金部、を備えている。
【００１２】
本発明では芯金部がピン受け孔位置において分割できるため、穿孔ピンによって加工対象物の側面に孔が開けられた時に発生する穿孔屑は、芯金部を加工対象物から引き抜いた時に加工対象物の内部に取り残される。
【００１３】
すなわち、穿孔屑が芯金内に残留することがないので、穿孔屑を芯金内から取除く作業が不要となり、作業効率が向上する。また、抜きカスを芯金の内部孔であるカス抜き孔に通して取除くことがないので、形成できる孔のサイズがカス抜き孔のサイズに制限されることがなく、その分従来よりも大きな孔を開けることが可能となる。
【００１４】
また、請求項２の発明は、請求項１に記載の加工用受け具において、筒状の加工対象物の外周面と嵌合する内面形状を有する加工対象物ガイド穴と、該加工対象物ガイド穴に連通し、穿孔ピンを前記加工対象物ガイド穴に導くピンガイド孔と、を備えた金型内に、前記ピン受け孔と前記ピンガイド孔とが一直線となるように、前記ピン受け孔位置で分割された前記芯金部の少なくとも一方が形成されていることを特徴とする。
【００１５】
すなわち、金型に形成された加工対象物ガイド穴により加工対象物の外周面側からも加工対象物を保持するため、塑性孔抜き時に加工対象物が変形し難くなる。また、前記ピン受け孔と前記ピンガイド孔とが一直線となるように構成されているため、孔抜き時に穿孔ピンを確実に加工対象物の側面の孔形成位置に導くことができる。それと共に、孔抜き時に穿孔ピンが曲がるのをピンガイド孔によって防げるので穿孔ピンの寿命を延ばすことができる。
【００１６】
さらに、請求項３の発明は、請求項２に記載の加工用受け具において、前記ピン受け孔位置で分割された前記芯金部の両方が前記金型内に形成され、前記ピンガイド孔は、２つの金型の接合面位置で分割可能に形成されていることを特徴とする。
【００１７】
すなわち、前記ピン受け孔位置で分割された前記芯金部の両方が前記金型内に形成されているため、加工対象物の端面保持がより確実になり、変形防止効果を向上できる。すなわち、孔抜き時に加工対象物が変形する恐れがないので、従来よりも加工対象物の端面に近い位置で孔抜きを行うことができる。
【００１８】
それと共に、ピンガイド孔は、２つの金型の接合面位置で分割可能に形成されているため、金型内に穿孔屑が残る恐れもなく、その分効率的に孔抜き作業を行うことができる。さらに、加工対象物の共給排出機構が簡単になると共に、加工スピードが向上するという効果もある。
【００１９】
また、請求項４の発明の塑性孔抜き方法は、上記請求項１から請求項３のいずれか１項に記載の加工用受け具を用い、分割された芯金部のそれぞれを筒状の加工対象物の両端部から挿入し、筒状の加工対象物の外周面の前記ピン受け孔位置に対応する位置にピンガイド孔を設け穿孔ピンにより塑性孔抜きをし、塑性孔抜き後に前記分割された芯金部のそれぞれを前記筒状の加工対象物の両端部から引き抜くことを特徴とする塑性孔抜き方法である。
【００２０】
この方法によれば、穿孔屑の除去作業が不要であるので、作業性がよく生産性が向上するという利点がある。また、穿孔屑の大きさが芯金の内部孔の寸法ではなく、芯金の内部孔の寸法よりも大きな寸法の加工対象物の内部孔の寸法に制限されることとなるので、加工対象物の側面に従来よりも大きな孔を形成することができる。
【００２１】
さらに、請求項５の発明は、請求項４に記載の塑性孔抜き方法において、前記穿孔ピンによる塑性孔抜きは、前記端面押え部により筒状の加工対象物の両端面をクランプして固定して行うことを特徴とする。
【００２２】
孔抜き位置が加工対象物の端面に近い位置であると、孔抜き加工時に発生する加工抵抗に負けて端面が変形してしまうが、本発明の請求項５の方法では、加工対象物の両端面をクランプして固定しているため、加工抵抗に対抗して端面の変形を防止できるので、従来よりも端面に近い位置に孔を開けることができる。
【００２３】
【発明の実施形態】
以下、本発明の実施形態を図１から図７を参照しながら説明する。なお、第１の実施形態から第３の実施形態では、筒状の加工対象物として外径Φ１７ｍｍ、内径Φ１０ｍｍ、幅Ｗ１０ｍｍの円筒状部材２０ａを用い、この円筒状部材２０ａの側面に穿孔ピン３０により孔径Φ７ｍｍの孔を開ける場合について述べている。
【００２４】
〔第１の実施形態〕
図１から図３は、第１の実施形態の加工用受け具を示しており、この加工用受け具は、ピン受け孔位置で分割された２つの部材１０ａ、１０ｂ（以後、第１受け部材１０ａ、第２受け部材１０ｂと称す。）から構成されている。第１受け部材１０ａと第２受け部材１０ｂは、ほぼ同様の構造であり、個々の部材は、図１に示すように、端面１８に半円柱状の溝１６が形成され、かつ、加工対象となる円筒部材２０ａ（図３（Ａ）参照）の内部孔２２に嵌合可能な寸法の外形を備えた円柱部１２（芯金部）と、円柱部１２の外周面の予め定めた位置から周面に対し垂直に設けられた端面押え部１４とから構成されている。
【００２５】
以後、第１受け部材１０ａに形成された円柱部１２を第１円柱部１２ａ、半円柱状の溝１６を第１溝１６ａ、端面１８を第１端面１８ａ、端面押え部１４を第１端面押え部１４ａと称し、第２受け部材１０ｂに形成された円柱部１２を第２円柱部１２ｂ、半円柱状の溝１６を第２溝１６ｂ、端面１８を第２端面１８ｂ、端面押え部１４を第２端面押え部１４ｂと称する。
【００２６】
図２に示すように、第１溝１６ａと第２溝１６ｂが対向するように第１端面１８ａと第２端面１８ｂ同士を合わせたときの、第１押え部１４ａと第２押え部１４ｂ間の距離Ｄ、すなわち、第１円柱部１２ａと第２円柱部１２ｂとの高さの和は、筒状の加工対象物の幅寸法Ｗ（図３参照）と一致するように構成されている。また、第１円柱部１２ａと第２円柱部１２ｂとのそれぞれの高さｈ１、ｈ２は、図２に示すように第１端面１８ａと第２端面１８ｂ同士を合わせたときに、第１溝１６ａと第２溝１６ｂとによって形成される円柱状の孔１６の位置が加工対象物である円筒状部材２０ａ（図３参照）の穿孔予定位置と一致するように決定されている。この円柱状の孔１６は、後述する穿孔ピン３０の受け孔（以後、ピン受け孔１６と称す。）となる。
【００２７】
この様な加工用受け具を用いた塑性孔抜き方法について、図３を参照しながら説明する。まず、図３（Ａ）に示すように、加工対象物である円筒状部材２０と、第１受け部材１０ａと、第２受け部材１０ｂとを同軸に配置する。このとき、第１受け部材１０ａに設けられた第１溝１６ａと第２受け部材１０ｂに設けられた第２溝１６ｂとが対向するように第１受け部材１０ａと第２受け部材１０ｂとを配置する。
【００２８】
次に、図３（Ｂ）に示すように、第１受け部材１０ａと第２受け部材１０ｂとを円筒状部材２０ａの両端側から内部孔２２に挿入して、両端面を合わせ、前記第１溝１６ａと第２溝１６ｂとにより円筒状部材２０ａの内部孔２２内にピン受け孔１６を形成する。同時に、第１受け部材１０ａと第２受け部材１０ｂとを固定する。これにより、円筒状部材２０ａの両端面が第１端面押え部１４ａと第２端面押え部１４ｂとにより挟持されて、第１円柱部１２ａと第２円柱部１２ｂとの周面において回動不能に固定される。
【００２９】
その後、穿孔ピン３０をピン受け孔１６と同軸に配置し、円筒状部材２０ａの側壁に向かって移動させ、円筒状部材２０ａの側面を貫通してピン受け孔１６内に入り込むまで挿入する。これにより、円筒状部材２０ａの側面に貫通孔２４が形成される。このとき、穿孔ピン３０により円筒状部材２０ａの側面から切り離された部位は、穿孔屑としてピン受け孔１６内に落下することとなる。
【００３０】
穿孔ピン３０により貫通孔２４を形成した後、穿孔ピン３０を引き抜いてから、第１受け部材１０ａと第２受け部材１０ｂとの固定を解除し、第１受け部材１０ａと第２受け部材１０ｂとを円筒状部材２０ａの内部孔２２から引き抜いて側面に貫通孔２４が形成された円筒状部材２０ｂを得る。
【００３１】
このように、第１の実施形態では、芯金部がピン受け孔１６位置において第１円柱部１２ａと第２円柱部１２ｂとに分割される構成であるため、穿孔ピン３０による孔明けによってピン受け孔１６に落下した穿孔屑は、円筒状部材２０ａの内部孔２２に取り残されるので、この内部孔２２から容易に取除かれることとなる。
【００３２】
〔第２の実施形態〕
図４は、第２の実施形態の加工用受け具を示しており、この加工用受け具は、上記第１の実施の形態で説明したものと同様の構成の第１受け部材１０ａと、金型形状に構成された第３受け部材１０ｃとから構成されている。第１受け部材１０ａは上記第１の実施の形態で説明したものと同様の構成であるので説明は省略する。
【００３３】
また、第３受け部材１０ｃは、内径寸法が円筒状部材２０ａの外径寸法Ｒ１とほぼ同じで、内部に円筒状部材２０ａの内径寸法Ｒ２とほぼ同じ外径寸法の第３円柱部１２ｃが形成された、深さが円筒状部材２０ａの幅寸法Ｗと同じ寸法のガイド穴２８と、該ガイド穴２８に連通するピンガイド孔２６とを備えた金型形状に構成されている。なお、以後、第３受け部材１０ｃに形成された円柱部１２を第３円柱部１２ｃ、半円柱状の溝１６を第３溝１６ｃ、端面１８を第３端面１８ｃ、端面押え部１４を第３端面押え部１４ｃと称する。
【００３４】
第３受け部材１０ｃの第３円柱部１２ｃは、第１実施例で述べた第２受け部材１０ｂの第２円柱部１２ｂと同様の構成であり、第３受け部材１０ｃの第３端面押え部１４ｃは、ガイド穴２８の底面部分によって構成されている。また、ピンガイド孔２６は、第１円柱部１２ａと第３円柱部の端面１８ａ、１８ｃ同士を合わせたときに第１溝１６ａと第３溝１６ｃとにより形成されるピン受け孔と同径で、同軸上に配置されている。
【００３５】
以下、この様な加工用受け具を用いた塑性孔抜き方法について説明する。まず、図４に示すように、加工対象物である円筒状部材２０ａと、第１受け部材１０ａと、第３受け部材１０ｃのガイド穴２８とを同軸に配置する。このとき、第１受け部材１０ａに設けられた第１溝１６ａと第３受け部材１０ｃに設けられた第３溝１６ｃとが対向するように第１受け部材１０ａと第３受け部材１０ｃとを配置する。
【００３６】
次に、ガイド穴２８に円筒状部材２０ａを挿入してから第１受け部材１０ａの円柱部１２ａを円筒状部材２０ａの内部孔２２に挿入して、第３端面１８ｃと第１端面１８ａとを合わせ、前記第１溝１６ａと第３溝１６ｃとにより円筒状部材２０ａの内部孔２２内にピン受け孔１６を形成する。同時に、第１受け部材１０ａと第３受け部材１０ｃとを固定する。これにより、円筒状部材２０ａの両端面が第１端面押え部１４ａと第３端面押え部１４ｃとにより挟持されて、円筒状部材２０ａがガイド穴２８内で回動不能に固定される。
【００３７】
その後、穿孔ピン３０をピンガイド孔２６内に挿入して、円筒状部材２０ａの側面を貫通してピン受け孔１６内に入り込むまで挿入する。これにより、円筒状部材２０ａの側面に貫通孔２４が形成される。このとき、穿孔ピン３０により円筒状部材２０ａの側面から切り離された部位は、穿孔屑としてピン受け孔１６内に落下することとなる。
【００３８】
穿孔ピン３０により貫通孔２４を形成した後、穿孔ピン３０を引き抜いてから第１受け部材１０ａと第３受け部材１０ｃとの固定を解除し、第１受け部材１０ａを円筒状部材２０ａの内部孔２２から引き抜く。その後、ガイド穴２８から円筒状部材２０ａを取り出し、側面に貫通孔２４が形成された円筒状部材２０ｂを得る。
【００３９】
このように、第２の実施形態では、第１の実施形態の効果に加え、ガイド穴２８によって円筒状部材２０ａを外周面側からも保持するため、穿孔ピン３０による塑性孔抜き時に円筒状部材２０ａが変形するのを防止できる。また、ピン受け孔１６とピンガイド孔２６とが一直線となるように構成されているため、穿孔ピン３０を確実に円筒状部材２０ａ側面の孔形成位置に導くことができる。さらに、穿孔ピン３０が曲がるのを防げるので穿孔ピン３０の寿命を延ばすことができる。
【００４０】
〔第３の実施形態〕
図５は、第３の実施形態の加工用受け具を示しており、この加工用受け具は、ピン受け孔位置で分割された２つの対称構造の部材１０ｄ、１０ｅ（以後、第４受け部材１０ｄ、第５受け部材１０ｅと称す。）から構成されている。第４受け部材１０ｄと第５受け部材１０ｅには、それぞれ内径寸法が円筒状部材２０ａの外径寸法Ｒ１とほぼ同じで、内部に円筒状部材２０ａの内径寸法Ｒ２とほぼ同じ外径寸法の円柱部１２ｄ、１２ｅが形成されたガイド穴２８ｄ、２８ｅと、このガイド穴２８ｄ、１２ｅが開口する端面にガイド穴２８ｄ、２８ｅに連通するピンガイド孔２６を形成する半円柱状の溝２６ｄ、２６ｅとを備えた金型形状に構成されている。その他の構成は、上記第２の実施形態で述べた第３受け部材１０ｃと同様であるので説明は省略する。
【００４１】
なお、第４受け部材１０ｄに形成された円柱部を第４円柱部１２ｄ、第４円柱部１２ｄの端面に形成された半円柱状の溝を第４溝１６ｄ、第４円柱部１２ｄの端面を第４端面１８ｄ、端面押え部を第４端面押え部１４ｄ、ガイド穴を第４ガイド穴２６ｄ、第４受け部材１０ｄの第４ガイド穴２６ｄが開口する面を第４開口面１１ｄ、第４開口面１１ｄに形成された半円柱状の溝を第４ピンガイド溝２６ｄと称し、第５受け部材１０ｅに形成された円柱部を第５円柱部１２ｅ、第５円柱部１２ｅの端面に形成された半円柱状の溝を第５溝１６ｅ、第５円柱部１２ｅの端面を第５端面１８ｅ、端面押え部を第５端面押え部１４ｅ、第５受け部材１０ｅの端面に形成された半円柱状の溝を第５ピンガイド溝２６ｅ、第５受け部材１０ｅの第５ガイド穴２６ｅが開口する面を第５開口面１１ｅ、第５開口面１１ｅに形成された半円柱状の溝を第５ピンガイド溝２６ｅと称する。
【００４２】
また、第４端面１８ｄと第４開口面１１ｄ、及び、第５端面と第５開口面１１ｅとは、同一平面上に配置されるように構成されており、よってそれぞれの面に設けられる第４溝１６ｄと第４ピンガイド溝２６ｄ、及び第５溝１６ｅと第５ピンガイド溝２６ｅとは、同一面上に形成されていることとなる。これら第４溝１６ｄと第４ピンガイド溝２６ｄ、及び第５溝１６ｅと第５ピンガイド溝２６ｅとは、それぞれ軸線が同一線上となる配置に設けられている。従って、第４ピンガイド溝２６ｄと第５ピンガイド溝２６ｅとによって形成されるピンガイド孔２６を延長した位置に、第４溝１６ｄと第５溝１６ｅとによって形成されるピン受け孔１６が配置されることとなる。
【００４３】
以下、この様な加工用受け具を用いた塑性孔抜き方法について説明する。まず、図５に示すように、加工対象物である円筒状部材２０ａと、第４受け部材１０ｄのガイド穴２８と、第５受け部材１０ｅのガイド穴２８とを同軸に配置する。このとき、第４受け部材１０ｄに設けられた第１溝１６ａと第５受け部材１０ｅに設けられた第３溝１６ｃとは対向配置される。
【００４４】
次に、円筒状部材２０ａを一方のガイド穴（ここでは、第５受け部材１０ｅのガイド穴）挿入してから、第４受け部材１０ｄの第４開口面１１ｄと第５受け部材１０ｅの第５開口面１１ｅとを合わせる。これにより、図６の断面図に示すように、円筒状部材２０ａの内部にピン受け孔１６が形成されると同時に、円筒状部材２０ａの外部の金型部分にピンガイド孔２６が、同じ軸線上に形成される。第４開口面１１ｄと第５開口面１１ｅとを合わせた後、第４受け部材１０ｄと第５受け部材１０ｅとをクランプする。これにより、円筒状部材２０ａの両端面が第４端面押え部１４ｄと第５端面押え部１４ｅとにより挟持されて、円筒状部材２０ａがガイド穴２８内で回動不能に固定される。
【００４５】
その後、穿孔ピン３０をピンガイド孔２６内に挿入して、円筒状部材２０ａの側面を貫通してピン受け孔１６内に入り込むまで挿入する。これにより、円筒状部材２０ａの側面に貫通孔２４が形成される。このとき、穿孔ピン３０により円筒状部材２０ａの側面から切り離された部位は、穿孔屑としてピン受け孔１６内に落下することとなる。
【００４６】
穿孔ピン３０により貫通孔２４を形成した後、穿孔ピン３０を引き抜いてからクランプを解除し、第４受け部材１０ｄと第５受け部材１０ｅとを離し、一方のガイド穴２８ｄ（若しくは２８ｅ）から円筒状部材２０ａを取り出し、側面に貫通孔２４が形成された円筒状部材２０ｂを得る。
【００４７】
このように、第３の実施形態では、第２の実施形態の効果に加え、ピンガイド孔２６が分割される面で第４受け部材１０ｄと第５受け部材１０ｅとが分割される構成であるため、ピン受け孔１６内に落下した穿孔屑は、第４受け部材１０ｄと第５受け部材１０ｅとを離す際に、金型外に落下して取除かれる。従って、穿孔屑を取除くために円筒状部材２０ｂを斜めにするなどの作業が不要であり、その分作業効率が向上する。
【００４８】
さらに、ガイド穴２８ｄ、２８ｅの深さ寸法が円筒状部材２０ａの幅寸法Ｗに比べて短くなるので、円筒状部材２０ａをガイド穴２８ｄ（若しくは２８ｅ）に挿入する際の挿入距離が短くなる。そのため、円筒状部材２０ａの供給排出機構が簡単になり、それに伴って加工スピードが向上する。
【００４９】
また、第４受け部材１０ｄと第５受け部材１０ｅとをクランプすることによって円筒状部材２０ａの端面に孔開け加工時に発生する加工抵抗に抗する力が与えられているため、孔形成位置が端面に近い位置であっても円筒状部材２０ａの端面に大きな変形が生じることを抑えられるので、例えば、端面から抜き厚みの４０％程度の寸法と同程度の距離で加工でき、従来よりも端面に近い位置に孔を形成することが可能である。
【００５０】
以上述べた第１の実施形態から第３の実施形態によれば、穿孔屑の寸法は、円筒状部材２０ａの内部孔２２の寸法に対して５０％〜７５％程度の寸法にできるので、円筒状部材２０ａの側面に形成できる孔の寸法も円筒状部材２０ａの内部孔の寸法２２に対して５０％〜７５％程度の寸法とでき、従って、従来よりも大きな寸法孔を形成することが可能である。
【００５１】
なお、以上述べた全ての実施形態において、例えば、円柱部１２を伸縮可能に構成したり、端面押え部１４の位置を移動可能に構成することもでき、この様な構成とすることにより、１組の加工用受け具によって異なる側面位置に孔抜きすることが可能となる。
【００５２】
また、以上述べた第１の実施形態から第３の実施形態において得られたすべての円筒状部材２０ｂは、孔抜き精度のバラツキが０．０１ｍｍ以内であり、端面の変形度合いも０．０１ｍｍ以内となった。このような高精度の加工が可能であり、孔の精度の保証ができるため、得られる円筒状部材２０ｂはブレーキホースの口金具の一種であるメガネ金具の部品として利用することができる。
【００５３】
この場合、図７に示すように、首部７２が形成されたソケット部材７０を、ソケット部材７０の軸心と孔２４の中心とが一致するように配置し（図７（Ａ））、孔２４内に首部７２を挿入してプレージングロー付けにより一体化する（図７（Ｂ））。
【００５４】
【発明の効果】
以上説明したように、請求項１及び請求項２の発明によれば、抜きカス除去する作業が簡単であり、加工対象物に形成できる孔寸法を従来より大きくできる加工用受け具が得られる、という効果を達成する。
【００５５】
また、請求項３の発明によれば、上記請求項１及び請求項２の発明の効果に加え、加工対象物の孔抜き位置を従来よりも端面側とできる加工用受け具が得られる、という効果を達成する。
【００５６】
さらに、請求項４の発明では、作業性がよく生産性が向上する塑性孔抜き方法を提供できる、という効果を達成する。また、請求項５の発明では上記請求項４の発明の効果に加え、加工対象物の端面により近い位置に孔開けしても加工対象物の端面が大きく変形する恐れのない塑性孔抜き方法を提供できる、という効果を達成する。
【図面の簡単な説明】
【図１】本発明の第１の実施形態にかかる加工用受け具を構成する一方の部材を示す斜視図である。
【図２】図１に示した部材を２つ組み合わせて加工用受け具を構成した場合の上面図である。
【図３】図１及び図２に示した加工用受け具を用いて孔開けする方法を示した説明図である。
【図４】本発明の第２の実施形態にかかる加工用受け具を用いて孔開けする方法を示した説明図である。
【図５】本発明の第３の実施形態にかかる加工用受け具を用いて孔開けする方法を示した説明図である。
【図６】図５に示した加工用受け具内に円筒状部材を格納した時のＡ−Ａ線断面図である。
【図７】本実施形態で得られた孔開け済みの円筒状部材を用いて、メガネ金具を製造する場合の説明図である。
【図８】従来の加工用受け具を示す斜視図である。
【図９】金型を用いる場合の従来の加工用受け具を示す斜視図である。
【符号の説明】
１０ａ第１受け部材
１０ｂ第２受け部材
１２ａ第１円柱部
１２ｂ第２円柱部
１４ａ第１端面押え部
１４ｂ第２端面押え部
１６ａ第１溝
１６ｂ第２溝
１６ピン受け孔
１８ａ第１端面
１８ｂ第２端面
２０円筒状部材
２２内部孔
２４貫通孔
３０穿孔ピン[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a processing receiver, and in particular, a processing receiver and a processing receiver provided inside a cylindrical processing object when punching a side surface of the cylindrical processing object by plastic processing. The present invention relates to a plastic hole punching method using the above.
[0002]
[Prior art]
One method for forming a hole in the side surface of a cylindrical workpiece (hereinafter referred to as a workpiece) is a method as shown in FIG. This method is carried out in order to guarantee hole accuracy and prevent deformation of the workpiece, and a cylindrical cored bar 72 having an outer shape dimensioned to fit inside the cylindrical member 20, and a punching pin 30. With a cylindrical cored bar 72 inserted and fixed inside the cylindrical member 20, holes are formed by plastic working from the outside of the cylindrical member 20 to a predetermined punching position on the side surface by the punching pin 30. It is a method of removing.
[0003]
The metal core 72 is provided with an end surface retainer 74 that prevents the axial movement of the cylindrical member 20 at a position that is substantially separated from the width of the cylindrical member 20 from the end surface thereof. A receiving hole 76 for guiding the punched residue to the inner hole 79 of the cored bar 72 is provided at a side position of the cored bar 72 corresponding to the hole forming position on the side of the cored bar 72. The inner hole 79 of the cored bar 72 is used as a scraping hole for discharging the punched residue to the outside, and the punched residue generated when the hole is drilled on the side surface of the cylindrical member 20 by the punching pin 30 is discharged to the outside. It can be configured.
[0004]
Further, when the strength of the core metal 72 is insufficient, when the cylindrical member 20 is perforated to prevent the opening portion from sagging, or when it is required to perform drilling with high precision, or the cylindrical member When the position where the hole is to be formed is close to the end face of 20 and the end face may be deformed, molds 80a and 80b may be used as shown in FIG. In this case, a pin guide hole 82 for allowing the punching pin 30 to pass through is formed at a position corresponding to the hole forming position in the upper mold 80a disposed on the upper side.
[0005]
Therefore, the core metal 72 described in FIG. 8 is inserted into the cylindrical member 20 and stored in the upper and lower molds 80a and 80b, and the upper and lower molds 80a and 80b are clamped to thereby form cylinders in the upper and lower molds 80a and 80b. The cylindrical member 20 and the cored bar 72 are fixed, and the punching pin 30 is pressed against the side surface of the cylindrical member 20 through the pin guide hole 82 and punched.
[0006]
[Problems to be solved by the invention]
However, conventionally, since the punched residue is removed by passing through the scraper hole, which is the inner hole of the cylindrical metal core, in order to punch a large number of workpieces by plastic processing, There is a problem that work for removing waste must be performed frequently and workability is poor.
[0007]
Further, in order to remove the punched holes in the punched holes, the size of the punched holes generated when drilling must be made smaller than the diameter of the punched holes. There is a drawback that it is limited. That is, as a guide for the diameter of the hole that can be formed in the workpiece, the dimension is about 50% of the diameter of the punched hole. For example, when considering the shape of a round hole, it is up to about 25% of the inner diameter of the workpiece. Furthermore, there is a problem that the operation for removing the waste is difficult and the productivity is poor.
[0008]
In addition, the position where the workpiece can be punched is limited to a position separated from at least the end face by a dimension equal to or larger than the punching thickness in order to prevent deformation of the workpiece.
[0009]
In view of the above, a first object of the present invention is to provide a processing tool that can be easily removed and removed. It is a second object of the present invention to provide a processing receiver that can increase the hole size that can be formed in a workpiece. Furthermore, it is a third object to provide a processing tool capable of setting the hole punching position of the processing object to the end face side as compared with the prior art.
[0010]
Furthermore, a fourth object of the present invention is to provide a plastic hole punching method with good workability and improved productivity.
[0011]
[Means for Solving the Problems]
In order to achieve the first object, the processing receiver according to the first aspect of the present invention is configured such that when a hole is punched by plastic working on a side surface of a cylindrical processing object with a perforation pin, the cylindrical processing object is removed. Supporting processing supporter having an outer shape that fits inside a cylindrical workpiece Inserted into the cylindrical workpiece Corresponding to the planned drilling position on the side of the cylindrical workpiece. Place A pin receiving hole is formed in the device, and the pin receiving hole position can be divided. And an end face pressing portion for holding the end face of the cylindrical workpiece, and the punch pin penetrates the side surface of the cylindrical workpiece from the planned drilling position of the cylindrical workpiece. Then, the cylindrical machining target is obtained by dividing the perforated scraps that are cut off from the side surface of the cylindrical workpiece by being inserted into the pin receiving hole and being pulled out from the cylindrical workpiece. Leave inside the object Cored bar Department, I have.
[0012]
In the present invention, since the cored bar part can be divided at the pin receiving hole position, the drilling waste generated when a hole is made in the side surface of the workpiece by the drilling pin is processed when the cored bar part is pulled out from the workpiece. Left behind inside things.
[0013]
That is, since the drilling waste does not remain in the cored bar, it is not necessary to remove the drilled scraps from the cored bar, and the work efficiency is improved. In addition, since the punched residue is not removed by passing through the scraper hole, which is the inner hole of the cored bar, the size of the hole that can be formed is not limited by the size of the scraper hole, which is larger than the conventional one. It becomes possible to make a hole.
[0014]
Further, the invention of claim 2 is the processing receiver according to claim 1, wherein the processing object guide hole having an inner surface shape that fits with the outer peripheral surface of the cylindrical processing object, and the processing object guide The pin receiving hole is arranged so that the pin receiving hole and the pin guide hole are in a straight line in a mold provided with a pin guide hole that communicates with the hole and guides the punch pin to the workpiece guide hole. Divided by position Of the cored bar At least one of them is formed.
[0015]
That is, since the workpiece is held from the outer peripheral surface side of the workpiece by the workpiece guide hole formed in the mold, the workpiece is hardly deformed during plastic punching. Further, since the pin receiving hole and the pin guide hole are configured to be in a straight line, the punching pin can be reliably guided to the hole forming position on the side surface of the workpiece when punching. At the same time, the pin guide hole can prevent the drill pin from being bent at the time of punching, so that the life of the drill pin can be extended.
[0016]
Furthermore, the invention according to claim 3 is the processing receiver according to claim 2, wherein the pin receiving hole position is divided. Of the cored bar Both are formed in the mold, and the pin guide hole is formed to be separable at the joint surface position of the two molds.
[0017]
That is, it was divided at the pin receiving hole position Of the cored bar Since both are formed in the mold, it is possible to more reliably hold the end surface of the workpiece and to improve the deformation prevention effect. That is, since there is no fear that the workpiece is deformed when punching, it is possible to perform punching at a position closer to the end face of the workpiece than before.
[0018]
At the same time, the pin guide hole is formed so that it can be divided at the position of the joint surface between the two molds. it can. Furthermore, there is an effect that the joint supply and discharge mechanism of the workpiece is simplified and the machining speed is improved.
[0019]
According to a fourth aspect of the present invention, there is provided a plastic hole punching method according to the first to third aspects. of Using the processing receiver according to any one of the above, each of the divided cored bar portions is inserted from both ends of the cylindrical processing object, and the pin receiving hole on the outer peripheral surface of the cylindrical processing object A pin guide hole is provided at a position corresponding to the position, and a plastic hole is removed by a drill pin. And each of the divided cored bar portions is pulled out from both ends of the cylindrical workpiece after plastic hole punching. This is a plastic hole punching method characterized by the above.
[0020]
According to this method, there is an advantage that workability is improved and productivity is improved because the removal work of perforated waste is unnecessary. In addition, since the size of the drilling scrap is not limited to the size of the inner hole of the cored bar, it is limited to the size of the inner hole of the workpiece that is larger than the size of the inner hole of the cored bar. A larger hole than conventional can be formed on the side surface.
[0021]
Further, the invention of claim 5 is the plastic hole punching method according to claim 4, wherein the plastic hole punching by the punch pin is fixed by clamping both end faces of the cylindrical workpiece by the end face pressing portion. It is characterized by performing.
[0022]
When the hole punching position is close to the end surface of the workpiece, the end surface is deformed by losing the machining resistance generated at the time of the hole punching, but in the method according to claim 5 of the present invention, both ends of the workpiece are processed. Since the surface is clamped and fixed, deformation of the end surface can be prevented against the machining resistance, so that a hole can be formed at a position closer to the end surface than in the prior art.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS. In the first to third embodiments, a cylindrical member 20a having an outer diameter of Φ17 mm, an inner diameter of Φ10 mm, and a width of W10 mm is used as a cylindrical workpiece, and a perforation pin 30 is provided on the side surface of the cylindrical member 20a. Describes the case of opening a hole with a hole diameter of Φ7 mm.
[0024]
[First Embodiment]
1 to 3 show a processing receiver according to the first embodiment. The processing receiver includes two members 10a and 10b (hereinafter referred to as a first receiving member) divided at pin receiving hole positions. 10a and the second receiving member 10b.). The first receiving member 10a and the second receiving member 10b have substantially the same structure. As shown in FIG. 1, each member has a semi-cylindrical groove 16 formed in the end face 18, and the workpiece is processed. A cylindrical portion 12 (core metal portion) having an outer dimension of a size that can be fitted into the inner hole 22 of the cylindrical member 20a (see FIG. 3A), and a circumferential position from a predetermined position of the outer peripheral surface of the cylindrical portion 12 It is comprised from the end surface pressing part 14 provided perpendicularly | vertically with respect to the surface.
[0025]
Thereafter, the cylindrical portion 12 formed in the first receiving member 10a is the first cylindrical portion 12a, the semi-cylindrical groove 16 is the first groove 16a, the end surface 18 is the first end surface 18a, and the end surface pressing portion 14 is the first end surface presser. The cylindrical portion 12 formed on the second receiving member 10b is called the second cylindrical portion 12b, the semi-cylindrical groove 16 is the second groove 16b, the end surface 18 is the second end surface 18b, and the end surface pressing portion 14 is the first portion 14a. This is referred to as a two end face pressing portion 14b.
[0026]
As shown in FIG. 2, when the first end face 18a and the second end face 18b are aligned with each other so that the first groove 16a and the second groove 16b are opposed to each other, the distance between the first presser portion 14a and the second presser portion 14b. The distance D, that is, the sum of the heights of the first cylindrical portion 12a and the second cylindrical portion 12b is configured to coincide with the width dimension W (see FIG. 3) of the cylindrical workpiece. Further, the heights h1 and h2 of the first columnar portion 12a and the second columnar portion 12b are set so that the first groove 16a and the second end surface 18b are aligned with each other, as shown in FIG. And the position of the columnar hole 16 formed by the second groove 16b is determined so as to coincide with the planned drilling position of the cylindrical member 20a (see FIG. 3) that is the object to be processed. The cylindrical hole 16 serves as a receiving hole for a perforated pin 30 to be described later (hereinafter referred to as a pin receiving hole 16).
[0027]
A plastic hole punching method using such a processing receiver will be described with reference to FIG. First, as shown in FIG. 3A, the cylindrical member 20, which is the object to be processed, the first receiving member 10a, and the second receiving member 10b are arranged coaxially. At this time, the first receiving member 10a and the second receiving member 10b are arranged so that the first groove 16a provided in the first receiving member 10a and the second groove 16b provided in the second receiving member 10b face each other. To do.
[0028]
Next, as shown in FIG. 3 (B), the first receiving member 10a and the second receiving member 10b are inserted into the inner hole 22 from both ends of the cylindrical member 20a, and the both end surfaces are aligned with each other. The pin receiving hole 16 is formed in the inner hole 22 of the cylindrical member 20a by the groove 16a and the second groove 16b. At the same time, the first receiving member 10a and the second receiving member 10b are fixed. As a result, both end surfaces of the cylindrical member 20a are sandwiched between the first end surface pressing portion 14a and the second end surface pressing portion 14b so that they cannot rotate on the circumferential surfaces of the first columnar portion 12a and the second columnar portion 12b. Fixed.
[0029]
Thereafter, the piercing pin 30 is arranged coaxially with the pin receiving hole 16, moved toward the side wall of the cylindrical member 20 a, and inserted until it penetrates the side surface of the cylindrical member 20 a and enters the pin receiving hole 16. Thereby, the through-hole 24 is formed in the side surface of the cylindrical member 20a. At this time, the part cut off from the side surface of the cylindrical member 20a by the punching pin 30 falls into the pin receiving hole 16 as punching waste.
[0030]
After the through hole 24 is formed by the perforation pin 30, the perforation pin 30 is pulled out, and then the first receiving member 10a and the second receiving member 10b are released, and the first receiving member 10a and the second receiving member 10b Is extracted from the internal hole 22 of the cylindrical member 20a to obtain a cylindrical member 20b having a through hole 24 formed on the side surface.
[0031]
As described above, in the first embodiment, the cored bar portion is divided into the first cylindrical portion 12a and the second cylindrical portion 12b at the pin receiving hole 16 position. Since the perforated scraps that have fallen into the receiving hole 16 are left behind in the internal hole 22 of the cylindrical member 20a, they are easily removed from the internal hole 22.
[0032]
[Second Embodiment]
FIG. 4 shows a processing receiver according to the second embodiment. The processing receiver includes a first receiving member 10a having the same configuration as that described in the first embodiment, and a gold It is comprised from the 3rd receiving member 10c comprised by the mold shape. Since the first receiving member 10a has the same configuration as that described in the first embodiment, description thereof is omitted.
[0033]
Further, the third receiving member 10c has an inner diameter dimension substantially the same as the outer diameter dimension R1 of the cylindrical member 20a, and a third cylindrical portion 12c having an outer diameter dimension substantially the same as the inner diameter dimension R2 of the cylindrical member 20a is formed inside. The guide hole 28 having the same depth as the width dimension W of the cylindrical member 20a and a pin guide hole 26 communicating with the guide hole 28 are configured in a mold shape. Hereinafter, the cylindrical portion 12 formed in the third receiving member 10c is the third cylindrical portion 12c, the semi-cylindrical groove 16 is the third groove 16c, the end surface 18 is the third end surface 18c, and the end surface pressing portion 14 is the third. This is referred to as an end face pressing portion 14c.
[0034]
The third cylindrical portion 12c of the third receiving member 10c has the same configuration as the second cylindrical portion 12b of the second receiving member 10b described in the first embodiment, and the third end surface pressing portion 14c of the third receiving member 10c. Is constituted by a bottom surface portion of the guide hole 28. Further, the pin guide hole 26 has the same diameter as the pin receiving hole formed by the first groove 16a and the third groove 16c when the end surfaces 18a, 18c of the first cylindrical portion 12a and the third cylindrical portion are brought together. Are arranged on the same axis.
[0035]
Hereinafter, a plastic hole punching method using such a working support will be described. First, as shown in FIG. 4, the cylindrical member 20a that is the object to be processed, the first receiving member 10a, and the guide hole 28 of the third receiving member 10c are arranged coaxially. At this time, the first receiving member 10a and the third receiving member 10c are arranged so that the first groove 16a provided in the first receiving member 10a and the third groove 16c provided in the third receiving member 10c face each other. To do.
[0036]
Next, after inserting the cylindrical member 20a into the guide hole 28, the column portion 12a of the first receiving member 10a is inserted into the inner hole 22 of the cylindrical member 20a, and the third end face 18c and the first end face 18a are connected. In addition, the pin receiving hole 16 is formed in the inner hole 22 of the cylindrical member 20a by the first groove 16a and the third groove 16c. At the same time, the first receiving member 10a and the third receiving member 10c are fixed. Thereby, both end surfaces of the cylindrical member 20a are clamped by the first end surface pressing portion 14a and the third end surface pressing portion 14c, and the cylindrical member 20a is fixed in the guide hole 28 so as not to rotate.
[0037]
Thereafter, the piercing pin 30 is inserted into the pin guide hole 26 until it penetrates the side surface of the cylindrical member 20 a and enters the pin receiving hole 16. Thereby, the through-hole 24 is formed in the side surface of the cylindrical member 20a. At this time, the part cut off from the side surface of the cylindrical member 20a by the punching pin 30 falls into the pin receiving hole 16 as punching waste.
[0038]
After the through hole 24 is formed by the perforating pin 30, the first receiving member 10a and the third receiving member 10c are released from being fixed after the perforating pin 30 is pulled out, and the first receiving member 10a is moved to the inner hole of the cylindrical member 20a. Pull out from 22. Then, the cylindrical member 20a is taken out from the guide hole 28, and the cylindrical member 20b having the through hole 24 formed on the side surface is obtained.
[0039]
As described above, in the second embodiment, in addition to the effects of the first embodiment, the cylindrical member 20a is also held from the outer peripheral surface side by the guide hole 28. The deformation of 20a can be prevented. Further, since the pin receiving hole 16 and the pin guide hole 26 are configured to be in a straight line, the drill pin 30 can be reliably guided to the hole forming position on the side surface of the cylindrical member 20a. Furthermore, since the piercing pin 30 can be prevented from bending, the life of the piercing pin 30 can be extended.
[0040]
[Third Embodiment]
FIG. 5 shows a processing receiver according to the third embodiment. This processing receiver has two symmetrical members 10d and 10e (hereinafter referred to as a fourth receiving member) divided at the pin receiving hole positions. 10d and 5th receiving member 10e.). Each of the fourth receiving member 10d and the fifth receiving member 10e has a cylinder with an inner diameter dimension that is substantially the same as the outer diameter dimension R1 of the cylindrical member 20a and an inner diameter dimension that is substantially the same as the inner diameter dimension R2 of the cylindrical member 20a. Guide holes 28d and 28e in which the portions 12d and 12e are formed, and semi-cylindrical grooves 26d and 26e that form pin guide holes 26 communicating with the guide holes 28d and 28e on the end surfaces where the guide holes 28d and 12e open. It is comprised in the metal mold | die shape provided with. Other configurations are the same as those of the third receiving member 10c described in the second embodiment, and the description thereof is omitted.
[0041]
The cylindrical portion formed on the fourth receiving member 10d is the fourth cylindrical portion 12d, the semi-cylindrical groove formed on the end surface of the fourth cylindrical portion 12d is the fourth groove 16d, and the end surface of the fourth cylindrical portion 12d is the end surface. The fourth end surface 18d, the end surface pressing portion is the fourth end surface pressing portion 14d, the guide hole is the fourth guide hole 26d, and the surface where the fourth guide hole 26d of the fourth receiving member 10d opens is the fourth opening surface 11d, the fourth opening. The semi-cylindrical groove formed on the surface 11d is referred to as a fourth pin guide groove 26d, and the cylindrical portion formed on the fifth receiving member 10e is formed on the end surfaces of the fifth cylindrical portion 12e and the fifth cylindrical portion 12e. The semi-cylindrical groove is formed in the fifth groove 16e, the end surface of the fifth cylindrical portion 12e is the fifth end surface 18e, the end surface pressing portion is the fifth end surface pressing portion 14e, and the end surface of the fifth receiving member 10e is a semi-cylindrical shape. The groove is a fifth pin guide groove 26e and a fifth guide of the fifth receiving member 10e. 26e is a face that opens the fifth opening surface 11e, referred to as a groove semicylindrical formed in the fifth opening surface 11e fifth pin guide groove 26e.
[0042]
Further, the fourth end surface 18d and the fourth opening surface 11d, and the fifth end surface and the fifth opening surface 11e are configured to be arranged on the same plane, and thus the fourth end surface provided on each surface. The groove 16d and the fourth pin guide groove 26d, and the fifth groove 16e and the fifth pin guide groove 26e are formed on the same surface. The fourth groove 16d and the fourth pin guide groove 26d, and the fifth groove 16e and the fifth pin guide groove 26e are provided so that their axes are on the same line. Accordingly, the pin receiving hole 16 formed by the fourth groove 16d and the fifth groove 16e is disposed at a position where the pin guide hole 26 formed by the fourth pin guide groove 26d and the fifth pin guide groove 26e is extended. Will be.
[0043]
Hereinafter, a plastic hole punching method using such a working support will be described. First, as shown in FIG. 5, the cylindrical member 20a that is the object to be processed, the guide hole 28 of the fourth receiving member 10d, and the guide hole 28 of the fifth receiving member 10e are arranged coaxially. At this time, the first groove 16a provided in the fourth receiving member 10d and the third groove 16c provided in the fifth receiving member 10e are arranged to face each other.
[0044]
Next, after inserting the cylindrical member 20a into one guide hole (in this case, the guide hole of the fifth receiving member 10e), the fourth opening surface 11d of the fourth receiving member 10d and the fifth opening of the fifth receiving member 10e. Align with the opening surface 11e. As a result, as shown in the cross-sectional view of FIG. 6, the pin receiving hole 16 is formed inside the cylindrical member 20a, and at the same time, the pin guide hole 26 is formed on the same mold as the outer die portion of the cylindrical member 20a. Formed on the line. After matching the fourth opening surface 11d and the fifth opening surface 11e, the fourth receiving member 10d and the fifth receiving member 10e are clamped. Thereby, both end surfaces of the cylindrical member 20a are clamped by the fourth end surface pressing portion 14d and the fifth end surface pressing portion 14e, and the cylindrical member 20a is fixed in the guide hole 28 so as not to rotate.
[0045]
Thereafter, the piercing pin 30 is inserted into the pin guide hole 26 until it penetrates the side surface of the cylindrical member 20 a and enters the pin receiving hole 16. Thereby, the through-hole 24 is formed in the side surface of the cylindrical member 20a. At this time, the part cut off from the side surface of the cylindrical member 20a by the punching pin 30 falls into the pin receiving hole 16 as punching waste.
[0046]
After the through-hole 24 is formed by the perforating pin 30, the clamp is released after the perforating pin 30 is pulled out, the fourth receiving member 10d and the fifth receiving member 10e are separated, and a cylinder is formed from one guide hole 28d (or 28e). The cylindrical member 20a is taken out to obtain a cylindrical member 20b having a through hole 24 formed on the side surface.
[0047]
Thus, in the third embodiment, in addition to the effects of the second embodiment, the fourth receiving member 10d and the fifth receiving member 10e are divided on the surface where the pin guide hole 26 is divided. Therefore, the perforated scraps falling into the pin receiving hole 16 are dropped and removed from the mold when the fourth receiving member 10d and the fifth receiving member 10e are separated. Therefore, an operation such as slanting the cylindrical member 20b in order to remove perforated waste is unnecessary, and the work efficiency is improved accordingly.
[0048]
Further, since the depth dimension of the guide holes 28d and 28e is shorter than the width dimension W of the cylindrical member 20a, the insertion distance when the cylindrical member 20a is inserted into the guide hole 28d (or 28e) is shortened. Therefore, the supply / discharge mechanism of the cylindrical member 20a is simplified, and the processing speed is improved accordingly.
[0049]
Moreover, since the force which resists the process resistance which generate | occur | produces at the time of drilling is given to the end surface of the cylindrical member 20a by clamping the 4th receiving member 10d and the 5th receiving member 10e, a hole formation position is an end surface. Since it is possible to prevent large deformation from occurring on the end face of the cylindrical member 20a even at a position close to the position, for example, the end face can be processed at a distance equivalent to the dimension of about 40% of the punched thickness. It is possible to form a hole in a close position.
[0050]
According to the first to third embodiments described above, the size of the drilling waste can be set to about 50% to 75% with respect to the size of the internal hole 22 of the cylindrical member 20a. The size of the hole that can be formed on the side surface of the cylindrical member 20a can also be about 50% to 75% of the internal hole size 22 of the cylindrical member 20a. Therefore, it is possible to form a larger size hole than before. It is.
[0051]
In all the embodiments described above, for example, the cylindrical portion 12 can be configured to be extendable and the position of the end surface pressing portion 14 can be configured to move. It becomes possible to punch holes at different side positions depending on the set of processing receivers.
[0052]
Further, all the cylindrical members 20b obtained in the first to third embodiments described above have a variation in the punching accuracy within 0.01 mm, and the degree of deformation of the end faces also within 0.01 mm. It became. Since such high-precision processing is possible and the accuracy of the hole can be guaranteed, the obtained cylindrical member 20b can be used as a part of a spectacle fitting that is a kind of a fitting for a brake hose.
[0053]
In this case, as shown in FIG. 7, the socket member 70 in which the neck portion 72 is formed is arranged so that the axis of the socket member 70 and the center of the hole 24 coincide with each other (FIG. 7A). The neck portion 72 is inserted into the inner portion and integrated by pressing brazing (FIG. 7B).
[0054]
【The invention's effect】
As described above, according to the first and second aspects of the invention, the work of removing the scraps is simple, and a processing receptacle that can increase the hole size that can be formed in the workpiece is obtained. To achieve the effect.
[0055]
Further, according to the invention of claim 3, in addition to the effects of the inventions of claim 1 and claim 2, it is possible to obtain a processing receiver that can make the hole punching position of the workpiece to be end face side than the conventional one. Achieve effect.
[0056]
Furthermore, the invention of claim 4 achieves the effect that it is possible to provide a plastic hole punching method with good workability and improved productivity. Further, in the invention of claim 5, in addition to the effect of the invention of claim 4, there is provided a plastic punching method in which even if a hole is drilled at a position closer to the end face of the workpiece, the end face of the workpiece is not greatly deformed. Achieve the effect of being able to provide.
[Brief description of the drawings]
FIG. 1 is a perspective view showing one member constituting a processing receiver according to a first embodiment of the present invention.
FIG. 2 is a top view when a processing receiver is configured by combining two members shown in FIG. 1;
FIG. 3 is an explanatory view showing a method of drilling using the processing receiver shown in FIGS. 1 and 2;
FIG. 4 is an explanatory view showing a method for making a hole using a processing receiver according to a second embodiment of the present invention.
FIG. 5 is an explanatory view showing a method of drilling using a processing receiver according to a third embodiment of the present invention.
6 is a cross-sectional view taken along line AA when a cylindrical member is stored in the processing receiver shown in FIG. 5. FIG.
FIG. 7 is an explanatory diagram in the case of manufacturing eyeglass fittings using a perforated cylindrical member obtained in the present embodiment.
FIG. 8 is a perspective view showing a conventional processing receiver.
FIG. 9 is a perspective view showing a conventional processing receiver when a mold is used.
[Explanation of symbols]
10a First receiving member
10b Second receiving member
12a First cylindrical part
12b Second cylindrical part
14a First end face pressing part
14b Second end face pressing part
16a 1st groove
16b Second groove
16 pin receiving hole
18a First end face
18b Second end face
20 Cylindrical member
22 Internal hole
24 Through hole
30 Drilling pin

Claims

A processing support for supporting a cylindrical workpiece when punching by plastic working on the side surface of the cylindrical workpiece with a perforation pin,
With an outer shape which fits inside a cylindrical workpiece, position that corresponds to the drilling plan position of the side surface of the tubular inner it is inserted into Rutotomoni cylindrical workpiece of the workpiece pin receiving hole is formed in the divided capable constructed in the pin receiving holes located Rutotomoni, the end surface pressing portion for holding the end surfaces of the tubular workpiece is formed, machining the piercing pin of the cylindrical The drilling scraps separated from the side surface of the cylindrical workpiece are divided by being inserted into the pin receiving hole through the side surface of the cylindrical workpiece from the planned drilling position of the target object. A cored bar portion that remains inside the cylindrical workpiece by being pulled out from the cylindrical workpiece ,
Working receptacle, characterized in that it comprises a.

A workpiece guide hole having an inner surface shape that fits with the outer peripheral surface of the cylindrical workpiece,
A pin guide hole that communicates with the workpiece guide hole and guides a piercing pin to the workpiece guide hole;
Wherein at least one of the core metal parts divided at the pin receiving hole position is formed so that the pin receiving hole and the pin guide hole are in a straight line. The processing receiver according to claim 1.

Both the core metal parts divided at the pin receiving hole positions are formed in the mold, and the pin guide holes are formed so as to be split at the joining surface positions of the two molds. The processing receptacle according to claim 2.

Using the processing receiver according to any one of claims 1 to 3 , each of the divided cored bar portions is inserted from both ends of the cylindrical workpiece, and the cylindrical workpiece is processed. A pin guide hole is provided at a position corresponding to the position of the pin receiving hole on the outer peripheral surface of the object, and a plastic hole is punched by a punching pin , and each of the divided cored bar parts after the plastic hole is punched is the cylindrical workpiece. A plastic hole punching method characterized by pulling out from both ends .

5. The plastic hole punching method according to claim 4, wherein the plastic hole punching by the punching pin is performed by clamping and fixing both end faces of the cylindrical workpiece by the end face pressing portion.